asp.net-mvc - 为依赖注入(inject)设置过滤器属性以接受构造函数中的参数

Question

我正在关注此 page 上的 ninject 过滤器属性设置。 .

对他们来说，他们有:

.WithConstructorArgumentFromControllerAttribute<LogAttribute>(
      "logLevel", attribute => attribute.LogLevel);

第二个参数是 Func<LogAttribute, object> callback .他们的实际参数列表设置如下:

Log(LogLevel = Level.Debug)

但我的过滤器属性设置如下:

public class AuthAttribute : FilterAttribute { }

public class AuthFilter : IAuthorizationFilter
{

    private readonly IUserService userService;
    private string[] roles;

    //Stuck on the constructor also. How do I accept params?
    public AuthFilter(IUserService userService, params string[] roles)
    {
        this.userService = userService;
        this.roles = roles;
    }
    public void OnAuthorization(AuthorizationContext filterContext)
    {
        throw new NotImplementedException();
    }
}

不知何故，这是错误的。因为我希望我的过滤器看起来像:

[Auth("Admin", "Contrib")]

我的绑定(bind):

 kernel.BindFilter<AuthFilter>(FilterScope.Controller, 0)
            .WhenControllerHas<AuthAttribute>()
            .WithConstructorArgumentFromControllerAttribute<AuthAttribute>("roles", /*Stuck here*/)

Answer 1

您需要将角色变成属性中的属性。

属性:

public class AuthAttribute : FilterAttribute 
{ 
  public string[] Roles { get; set; }

  public AuthAttribute(params string[] roles)
  {
      this.Roles = roles;
  }
}

筛选:

public class AuthFilter : IAuthorizationFilter
{

  private readonly IUserService userService;
  private readonly string[] roles;

  public AuthFilter(IUserService userService, string[] roles)
  {
    this.userService = userService;
    this.roles = roles;
  }

  public void OnAuthorization(AuthorizationContext filterContext)
  {
    //do stuff
  }
}

Controller

   [AuthAttribute("a", "b")]
   public class YourController : Controller 
   {

   }

捆绑:

kernel.BindFilter<AuthFilter>(FilterScope.Controller, 0)
            .WhenControllerHas<AuthAttribute>()
            .WithConstructorArgumentFromControllerAttribute<AuthAttribute>("roles", attribute => attribute.Roles);